Sound amplifier



FIG. 1 is a front view of a sound amplifier;

FIG. 2 is a rear view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a left-side view thereof;

FIG. 5 is a right-side view thereof; and,

FIG. 6 is a bottom view thereof. 

The ornamental design for a sound amplifier, as shown. 